HTML onbeforeprint Event Attribute - Playground Example

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>onbeforeprint event</title>
</head>
<body onbeforeprint="test()">
<h1>Try to print this document.</h1>
<p><b>Tip:</b>The keyboard shortcut Ctrl + P prints the page.</p>
<p><b>Note:</b>The onbeforeprint event is supported only in Internet Explorer and Firefox.</p>
<script>
function test() {
    alert("EXAMPLE: You are about to print this document!");
}
</script>
</body>
</html>